Romanian knowledge in the field of underground economy is permissive enough for scientifically innovation. Even if in the literature there are over 40 terms to describe underground economy activities there is still need for order and terminological classification.
Actual study is exposing the underground economy components presenting the way underground economy with its components are functioning in Romania after 1989.
The second section of this paper is showing up the arguments to sustain more the compatibility of qualitative research then quantitative research for analyzing underground economy.
In the end of the book there are exposed and detailed some solutions meant to diminish the negative effects generated by underground economy in Romania. Underground economy become an extended component in Romanian economy witch cannot be neglected.